Buffer overflow in multiple "p" commands in IBM AIX 5.1, 5.2 and 5.3 might allow local users to execute arbitrary code via long command line arguments to (1) penable or other hard-linked files including (2) pdisable, (3) pstart, (4) phold, (5) pdelay, or (6) pshare.
http://www.securityfocus.com/bid/13915
http://www.security-focus.com/advisories/8684
http://www.caughq.org/advisories/CAU-2005-0006.txt